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A. ROESGH. DIAPHRAGM CHAMBER No. 602,108. I Patented Apr. 12,1898.

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UNITED ST TES PATENT OFF E.

ALFRED ROESOH, OF BRIDGEPORT; CONNECTICUT, ASSIGNOR TO THE DAVIS & ROESCH TEMPERATURE TRQLLING COMPANY, OF NEW JERSEY.

r DIAPHRAGM-CHA BER.

, srnomIoA'rIoNromlin part of Letters Patent No. 602,108, dated April 12, i898. Application filed November 23,1897. Serial No. 659,566. (Nomodel.) 7

- which thefollowing is a specification.

My invention relates to improvements in the construction of that classof diaphragm chambers which are employed with compressed air or otherfluid under pressure for actuating fluid-controlling valves.

My improvement pertains more especially, first, to the device employedfor securing the diaphragm and walls of the diaphragm-chamber together,and, second, to the device employed for closing the fluid-controllingvalve by hand independently of the action of the diaphragm when thepressure in the diaphragm-chamber is removed.

The construction of my device is explained by reference to theaccompanying drawings, in which- Figure 1 represents a'vertical sectionof the diaphragm-chamber in connection with the fluid-controlling valvemechanism. Fig. 2 is a detail showing a top view of the screw bywhich'the diaphragm-retaining disk is secured in place. Fig. 3 is adetail showing'a top view of the lever by which the fluid-con trollingvalve is closed when the diaphragm is relieved from pressure. a

Like parts are referred to by the same reference-letters in the severalviews.

' As heretofore constructed it"has been com-.

mon to secure the upper wall A of the chamber to an annular seat Bagainst the diaphragm O by a series of bolts or screws or by threadingthe peripheries of the wall and seat. By my improvement I am enabled todispense with the bolts or screws heretofore used and also to dispensewith the threads in the periphery of the wall of the chamber and seat,

whereby the construction is simplified and O and; holds it firmlyagainst its seat B, thus forming an air-tight chamber between thediaphragm O and said disk E. The disk E is forced downward against thediaphragm, as stated, by a single central screw F, which screw hasscrew-threaded bearings G in the wall A and bears at its lower endagainst the upper wall of said disk E, whereby as said screw G is turneddownward against said disk the same is forced firmly against theperiphery of said diaphragm, as stated, thus forming a close joint.

The object of the inclosing Wall or cap A is to serve simply as asupporting-bearing for the central fastening-screw F, in connection withthe diaphragm C. It is obvious, however, that said fastening-screw maybe thus supported in connection with the seat by an open bracket orspider instead of an unbroken continuous wall, as shown. Air or otherfluid under pressure is led to the space between said disk E and thediaphragm through the central duct H, whereby said diaphragm isforceddownward and the fluid-controlling valve I is closed, motion beingcommunicated from said diaphragm through the diaphragmbearing plate Aand the valve-stem J. When said chamber is released from pressure, thediaphragm O is thrown upward and said fiuidcontrolling valve is openedby the recoil of the spiral spring K.

The central screw F is provided with a recess L for the reception ofawrench, by which it is turned and adjusted 'in its bearings against thedisk E. To provide for closing the valve I against its seat M, as maysometimes be desired, when said diaphragm-chamber is relieved frompressure, I have employed a valve-actuating lever N, which is f ulcrumedts a stationary bracket O'upon the pivotal bolt 1? and is connectedatits inner end to the valve stem J between the, diaphragmbearing plate Aand the collar or flange Q,

whereby as the outer end of the arm N is raised said valve is'forceddownward to its 5 ICO aperture B in said lever N, whereby as said screwis turned upward it carries with it the outward end of said lever N,thereby causing the inner end of said lever to be thrown downward,carrying with it said valve-stem and valve, whereby said fluid-valve isclosed and retained in its closed position, as stated, independently ofthe action of said diaphragm. The bracket 0 may, if desired, be castinte- -gral with the seat or wall of the diaphragmin Fig. 1.

The lower end of the hand-screw S is provided with an operating-knob V,which bears at its upper surface against the underside of the lever N asit is turned, thus communicating the required movement to said leverwhen desirous to close the valve.

All that part of the device below the valve seat B, by which such seatis connected with and supported from the valve-chamber D, consisting ofthe supporting-arms E E,stuffin g-nut l and the central part G, are ofthe ordinary construction and well known to those skilled in the art towhich the invention pertains.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is

1. In a diaphragm-chamber, the combination with an annulardiaphragm-seat and diaphragm; of an interior wall or disk adapted toimpinge upon the periphery of said dia-' phragm, above its seat; anexterior inclosing wall located above said disk, secured at intervals tosaid annular seat; and a central binding-screw having screw-threadedbearings in said exterior wall and adapted, as it is turned downward, tobear against said interior wall or disk, whereby the latter is retainedin close contact with said diaphragm, substantially as and for thepurpose specified.

2. In a diaphragm-chamber, the combination with an annulardiaphragm-seat B and diaphragm O; of an interior wall or disk E, adaptedtoimpinge upon the periphery of said diaphragm above its seat; anexterior inclosing Wall A located above said disk E; two or morefastening-pins D located at intervals in the contiguous bearings of saidexterior wall A and said diaphragm-seat B, by which said parts aresecured together; and a central bearing-screw F having screw-threadedbearings G in said exterior wall, and adapted, as it is turned downward,to bear against said interior wall or disk E, whereby the latter isretained in close contact with said diaphragm, said diaphragm is forcedfirmly to its seat, and an air-tight chamber is formed between saiddiaphragm and saidinclosing disk E, substantially as and for the purposespecified.

3. In that class of diaphragm-chambers in which the diaphragms areactuated by compressed air for operating fluid-controlling valves, thedevice herein described for actuating the fluid-controlling valveindependently of the action of said diaphragm, when the same is relievedfrom pressure, consisting in the combination with a diaphragmchamber andthestem of a fluid-controlling valve of an actuating-lever centrallypivoted to a supporting-bracket and connected at one end with thevalve-stem of said fluid-controlling valve, and at its opposite end, byan ad justing-screw, with the screw-threaded bearings of a stationarysupporting-arm, whereby, as said screw is turned forward in its bearings, said lever is swung upon its pivotal support, and saidfluid-controlling valve is forced to its seat, substantially as and forthe purpose specified.

4. In that class of diaphragm-chambers in which the diaphragms areactuated by compressed air for operating fluidcontrolling valves, thedevice herein described for actuating the fluid-controlling valveindependently of the action of said diaphragm, when the same is relievedfrom pressure, consisting in the combination with a diaphragm-chamberand the stem of a fluid-controlling valve of an actuating-lever; a leversupporting bracket adjust-ably attached to said diaphragm chamber; andan adj listing-screw having screw-threaded bearings in a projecting armof said bracket, said leverbein g centrally pivoted to saidsupporting-bracket and connected at one end with the valve-stem of saidfluid-controlling valve, and at its opposite end by saidadjusting-screw, with the screw-threaded bearings of a projecting armfrom said bracket, whereby, as said screw is turned forward in itsbearings, said lever is swung upon its pivotal support, and saidfluidcontrolling valve is forced to its seat, substantially as and forthe purpose specified.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

ALFRED ROESGII. Witnesses:

WM. E. IIATHEWAY, CLAES GABR. STRANDBERG.

